By Umeshwar Dayal (auth.), Mikael Berndtsson MSc, Jörgen Hansson MSc (eds.)
The components of energetic and real-time databases have noticeable an immense development of curiosity some time past few years, fairly with reference to their aid of time-critical and embedded purposes. ARTDB-95 supplied, consequently, a tremendous discussion board for researchers from either groups to debate study effects, and in addition to chart new instructions for the longer term. in addition to the eleven submitted papers provided on the workshop, this quantity additionally includes four invited papers at the following subject matters: the impression of energetic databases on advertisement perform; the optimization of lively database transactions; the necessity for higher language, compiler and gear help for real-time databases; and the beginning of time constraints linked to information, occasions and activities. jointly the papers provide a finished evaluate of present examine, and may supply necessary analyzing for tutorial and business researchers and scholars at either undergraduate and postgraduate level.
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Additional resources for Active and Real-Time Database Systems (ARTDB-95): Proceedings of the First International Workshop on Active and Real-Time Database Systems, Skövde, Sweden, 9–11 June 1995
This algorithm analyses both transaction programs having simple control structures (conditionals, loops, sequences), and rules in order to compute a compact data structure that indicates for each possible transaction execution which rule conditions can be activated more than once. For each such condition C, the data structure also indicates the data flow of events coming from the operations of the user-transaction and the rule action tasks towards C. 4 Reducing Inter-Transaction Blockings In the flat transaction model, a user transaction can block another one if it holds exclusive locks on data items that are needed by the other transaction.
Interaction, both for schedulability and for transformation, with the language and compiler of embedding applications must be studied. Time-bounded, hierarchical exception handling should be provided, likely with an emphasis on optimistic schemes and forward recovery. Apart from the classic language purist's position, there is another very important reason to provide all of the above (and other) support at the language level. While averaged performance improvements can be and are routinely achieved through mostly runtime techniques (transaction scheduling, locking, processing and so on), neither guaranteed predictable performance nor guaranteed coordination/synchronization can be addressed in this way.
Rules in A-RDL are partitioned in two sets: immediate rules and deferred rules. After each SQL statement S of the user·transaction, only immediate rules can be activated. The deferred rules are activated just before a checkpoint or a commit-transaction command. A deferred rule cannot activate an immediate rule and conversely. This policy can be expressed as follows: • the end of each SQL statement is a internal preemptive synchronization point. • an internal preemptive synchronization point is set just before each check· point statement and before the commit statement.